<div dir="ltr">Thanks John for the Reply.<div><br></div><div>So if i understand properly :</div><div>group 1 is here  <sip:anonymous@</div><div>group 2 is empty</div><div>group 3 is 

<span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">;tag=41008079_nab_FFFF_isp_</span><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">FFFF_cco_FFFF_igo_FFFF_mgt_</span><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">78DD</span>

</div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></div><div>the previous expression is working for IPv4.</div><div><br></div><div><br></div><div>Now for IPv6</div><div><br></div><div><div>Input         :           From: <sip:anonymous@[2008:abcd:1234:2260:208:5dff:fe93:5b65]>;tag=42006C96_nab_FFFF_isp_FFFF_cco_FFFF_igo_FFFF_mgt_8092</div><div>subst('/^From:(.*)[2008:abcd:1234:2260:208:5dff:fe93:5b65](.*)>(.*)/From:\1[2008:abcd:1234:2260:20c:29ff:fe9a:b9cb]>\3/ig');</div><div>Output      :           From: <sip:anonymous@[2008:abcd:1234:2260:208:5dff:fe93:5b6[2008:abcd:1234:2260:20c:29ff:fe9a:b9cb]>;tag=42006C96_nab_FFFF_isp_FFFF_cco_FFFF_igo_FFFF_mgt_8092    //what is going wrong here?</div></div><div><br></div><div>Here </div><div>group 1 is 

<span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span> </span><sip:anonymous@</span>

</div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">group 2 is empty</span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">group 3 is 

<span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">;tag=42006C96_nab_FFFF_isp_FFFF_cco_FFFF_igo_FFFF_mgt_8092</span>

</span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">what mistake am i making for IPv6 ? if you see the output.</span></span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Regards,</span></span></div><div><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Mahesh.b</span></span></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Jul 2, 2018 at 6:54 PM John Petrini <<a href="mailto:jpetrini@coredial.com">jpetrini@coredial.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>They are references to groups in the regex match. The groups are in parenthesis. Whatever is matched by group 1 and 3 will be included in the substitution.</div><div><br></div><div><a href="https://regexr.com/" target="_blank">https://regexr.com/</a> and <a href="https://regex101.com/" target="_blank">https://regex101.com/</a> are both good sites for building and explaining regexes.<br></div></div>
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